Bivariate Nonlinear Diffusion Degradation Process Modeling via Copula and MCMC

Table 1

Light intensity degradation data of 12 LEDs.

Unit	Inspection time (hour)
	0	50	100	150	200	250
PC1
1	100	86.6	78.7	76.0	71.6	68.0
2	100	82.1	71.4	65.4	61.7	58.0
3	100	82.7	70.3	64.0	61.3	59.3
4	100	79.8	68.3	62.3	60.0	59.0
5	100	75.1	66.7	62.8	59.0	54.0
6	100	83.7	74.0	67.4	63.0	61.3
PC2
1	100	73.0	65.0	60.7	58.3	58.0
2	100	86.2	67.6	62.7	60.0	59.7
3	100	81.2	65.0	60.6	59.3	57.3
4	100	66.8	63.3	59.3	57.3	56.5
5	100	66.1	64.2	59.4	58.0	55.3
6	100	76.5	61.7	61.3	59.7	56.0